PODCAST · arts
Filter Stories - Coffee Documentaries
by James Harper
Coffee stories with an extra shot of history and science. Filter Stories is a podcast revealing coffee’s hidden microscopic secrets, its powerful past, and how your choice of beans impacts tens of millions of people. See the behind-the-scenes stories on Instagram @filterstoriespodcast. If you haven’t already, please subscribe to the show and review us on Apple Podcasts and Spotify!
Episodes
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Producer Toolkit: Quality Assurance, Pt 2 - The basics of good water for coffee
This episode takes you through the basics of good water for coffee. To objectively assess a coffee's quality, both producer and buyer need to taste it using the same water. But whose water standards should you choose? Why do roasters often get to define what the "right" water is? What would the...
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Producer Toolkit: Quality Assurance, Pt 1 - A practical guide to tasting and roasting coffee
This episode is a practical guide to tasting coffee, sample roasting and judging quality, built for small producers on a tight budget. That makes it just as useful if you’re early in your coffee journey and want to learn the basics without spending thousands on equipment, starting with a frying…
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Producer Toolkit: Price, Pt 2 - Discovering the true value of coffee
What is the right price for coffee? This episode shows what the journey of price discovery looks like from the perspective of a coffee farmer. Part of The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis, it will help you understand coffee farming better than most...
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Producer Toolkit: Price, Pt 1 - How the commodity 'C' market works
This episode explores the strange world of the C market, where movements in the Brazilian currency or rebels boarding a random container ship decide the worth of a Colombian farmer's coffee. Yet specialty coffee still uses this number to price the coffees it says are anything but a commodity.…
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Producer Toolkit: Marketing & Sales, Pt 2 - Navigating trade shows
This episode explores what a trade show actually feels like for a farmer who flew in on money his community pooled together, why a sausage dog opened a door that hundreds of cold emails couldn't, and why learning English may be a better investment for a farmer than a longer fermentation. Part of...
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Producer Toolkit: Marketing & Sales, Pt 1 - The power of story
This episode explores why specialty coffee is a luxury business that runs on story more than flavour. Part of The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis, it will help you understand coffee farming better than most professionals you'll meet at a trade show. Each...
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Producer Toolkit: Fermentation, Pt 3 - Is using yeast cheating? And who decides?
This episode explores why 30 cents a kilo is trivial for a large farm and unaffordable for a small one, the strange power imbalance that lets roasters define quality when nobody asks a winemaker what yeast they used, and how producers can talk to buyers who think starter cultures are cheating.…
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Producer Toolkit: Fermentation, Pt 2 - The case for avoiding exciting fermentations
This episode explores why the specialty industry's obsession with exotic processing is a dangerous signal for farmers, five ways commercial microbes can make a farm more money, and what a well-run fermentation looks like on farms of very different sizes. Part of The Coffee Producer Toolkit, a...
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Producer Toolkit: Fermentation, Pt 1 - Nature's lottery and coffee's 3,000-year lag
This episode explores why coffee is only fifteen years into a fermentation revolution that wine and bread went through millennia ago, what's actually happening inside the tank when microbes multiply into billions on their own, and why farmers who used to ferment as fast as possible are now trying...
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Producer Toolkit: Processing, Pt 3 - Critical instruments and poisoned rivers
This episode explores how just a handful of cheap instruments can ensure quality is reproducible year-on-year, and the wastewater crisis poisoning rivers behind picture-perfect coffee farms. Part of The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis, it will help you...
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Producer Toolkit: Processing, Pt 2 - Drying mistakes that ruin coffee quality
This episode explores the simple drying mistakes that compromise months of careful work, and the low-cost fixes that protect a coffee's shelf life and flavour. Part of The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis, it will help you understand coffee farming better...
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Producer Toolkit: Processing, Pt 1 - Coffee rockstars and picking’s brutal economics
This episode explores why chasing avant-garde processing before nailing the basics is a trap for most producers, the brutal economics behind selectively picking and ways to sort coffee cherries in the wet mill. Part of The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis…
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Producer Toolkit: Farming, Pt 3 - Starved soils and vanishing labour
This episode explores what plants really need from the soil beneath them, and the labour shortage forcing farms to rethink how the work gets done. Part of The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis, it will help you understand coffee farming better than most...
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Producer Toolkit: Farming, Pt 2 - Water crisis, risky genetics and cash flow crunch
This episode explores the growing water crisis in coffee farming, why farmers are drawn to risky coffee varieties and coffee farming's hidden cashflow traps. Part of The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis, this series will help you understand coffee farming...
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Producer Toolkit: Farming, Pt 1 - Low harvests and profit blind spots
Welcome to The Coffee Producer Toolkit, a series made in collaboration with Lucia Solis. This series will help you understand coffee farming better than most professionals you'll meet at a trade show. Each episode takes one part of the farming business — agronomy, processing, fermentation…
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History: Guatemala’s Inconvenient Truth, Pt 2
Specialty coffee changes the story for the indigenous people of Guatemala. Coffee as a tool of oppression finally offers hope....and then something a bit more complicated. This episode explores the tension between the values of the Mayan communities who grow coffee, and the values that drive the...
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History: Guatemala’s Inconvenient Truth, Pt 1
When you buy a bag of coffee labelled fifth-generation family farm, it feels like a good choice. But in Guatemala, that label might actually be a signal for a more uncomfortable truth. This episode explores how land has been understood, used, and eventually fought over in Guatemala for centuries...
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History: Surrogates - Anything but the coffee
What happens when coffee disappears? This is not a thought experiment! It’s happened many times in history: War, blockades, tariffs, ideology, health panics, sanctions, supply shocks. When coffee is not around, people still need something warm, comforting, and familiar. And throughout history,...
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History: Ethiopia’s wild coffee forests
Most coffee is grown on vast plantations using machines, pesticides and fertilisers. But in Ethiopia, coffee grows wild in humid forests surrounded by birds. And that wild coffee matters more than most of us realise. It is the genetic ‘library’ we can turn to find new varieties to help us keep...
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History: Hamburg and Europe’s coffee trade
On a long walk through Hamburg, somewhere between the fish markets and giant cranes, you might stumble a giant bronze coffee bean looks like its crash landed from space. But this giant coffee bean represents a staggering fact: one in every three cups of coffee drunk in Europe has passed through...
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Introducing: Series Three of A History of Coffee
We’re back with more stories about the tiny psychoactive seed that changed the world and continues to shape our lives today. Is it possible to follow the story not just to Ethiopia, not just to a single town, but all the way back to one tree? We’ll uncover the uncomfortable history of Guatemala —…
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Science: Coffee Quality, Pt 3 - When the “quality” myth hits the farm
For twenty years, the 2004 cupping form profoundly shaped the specialty coffee world. But on the hillsides of coffee farms, some of the form’s byproducts have been disadvantaging producers. In this episode, we follow two producers whose lives collided with the myth of universal quality. These...
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Science: Coffee Quality, Pt 2 - How “quality” became a myth
If you ask two specialty professionals what makes a high-quality coffee, you’ll likely get a surprisingly consistent answer: clean, sweet, juicy, bright. To an outsider, they would be forgiven for thinking coffee quality is universally defined. But the truth is more sober. In this episode, we...
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Science: Coffee Quality, Pt 1 - The birth of specialty coffee flavours
For the longest time, coffees were dull and bitter. But then a small group of pioneers changed the world. In this episode, we travel back to the 1960s and ’70s to meet the trailblazers who realised coffees could taste distinctive: sweeter, brighter, cleaner. We discover how their personal...
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Science: How specialty coffee woke up to water’s role in flavour
For the longest time, the coffee community only cared about water’s impact ruining espresso machine boilers and kettles. But what about water’s impact on coffee flavour? In this episode, I tell the story of how the specialty coffee community came to understand water chemistry: the pioneering work...
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Science: Why prehistoric rock ruins coffee
550 million years ago, earth was perfect. We had perfect water for coffee AND we were living in a vegetarian paradise! But then Earth changed—violently. The planet shifted from a peaceful, plant-eating paradise to a darker, more brutal world. And in this new world, the chemistry of water was...
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Science: Water, Pt 2 - How to measure and treat it
Water massively impacts your coffee’s flavours. But most of us struggle to fix our water because water science is confusing… …until now! In this special collaboration with Lucia Solis (Making Coffee podcast), I guide her through the two most important concepts you need to understand to get...
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Science: Water, Pt 1 - Alkalinity, hardness and why it matters
Water massively impacts your coffee’s flavours. But most of us struggle to fix our water because water science is confusing… …until now! In this special collaboration with Lucia Solis (Making Coffee podcast), I guide her through the two most important concepts you need to understand to get...
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Science: Farm to port - why specialty costs more
Every time we open a bag of beautiful specialty coffee — like Erick Bravo’s from Finca El Chaferote in Huila, Colombia — we’re drinking something that’s been on a long journey. And I mean long! Over 1500 kilometers north up and down the Andes mountain range, a distance more than twice the height…
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Science: Why one Colombian farmer chose specialty, and the other walked away
I travel to Colombia’s Huila region to answer a question that’s puzzled me for years: if specialty coffee pays more, is better for the environment, and brews tastier cups—why don’t more farmers grow it? I speak with two producers in the same region whose choices couldn’t be more different. One...
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Science: The hard business of selling beautiful coffee, Pt 2
Volume. Cheap. Lame flavours. This is the traditional way of growing coffee in Brazil, and almost every farm does it this way. But what if you wanted to produce beautiful, distinctive flavours instead—and make a living from it? In this episode, we travel to Fazenda Paraíso in Minas Gerais…
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Science: The hard business of selling beautiful coffee, Pt 1
Volume. Cheap. Lame flavours. This is the traditional way of growing coffee in Brazil, and almost every farm does it this way. But what if you wanted to produce beautiful, distinctive flavours instead—and make a living from it? In this episode, we travel to Fazenda Paraíso in Minas Gerais…
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Science: How to roast more coffee, faster!
To roast coffee faster, you need to turn up the heat….right? No! In this episode, we explore the three powerful methods of heat transfer that revolutionised roasting. We’ll journey from humble beginnings—when roasting three kilos took half an hour—to machines that now roast hundreds of kilos of...
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Science: The chemistry of coffee roasting
A mother coffee plant gifts its baby everything it needs to grow—a green seed packed with food. But when we roast coffee, we hijack that gift and turn it into something else: flavor. But what is flavor, at a microscopic level? What actually happens inside the bean when heat meets those nutrients?...
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Science: Fruit juice or creamy almonds? Your guide to controlling cold brew flavors
When I started making cold brew this last year, I treated it like hot brew filter coffee. But no matter how I adjusted the grind or tweaked the brew time, I hardly got any differences in flavor… Then it hit me: cold brew isn’t just a slower hot brew—it’s a completely different game with its own...
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Science: Hot vs Cold - The science behind temperature and taste
For years, I used cold brew as a last resort—the only brew method to tame dark, oily beans that were too bitter for hot water. Then one day, I took a chance on a Guatemalan Gesha and brewed it cold. The result? A massive explosion of florals I’d never tasted before. That single cup sent opened my...
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Introducing: Season 3 of The Science of Coffee
We’re back with another series of The Science of Coffee—and this time we’re diving even deeper into coffee’s hidden microscopic secrets! Over the past year, narrative audio producer and coffee professional James Harper has scoured academic journals, ventured deep into coffee farms, and conducted...
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Science: How grinders work deep inside
Deep inside your coffee grinder, tiny changes can have massive consequences. This episode takes you deep inside Mahlkönig’s grinders to show you how coffee is ground and the importance of particle sizes on flavour. If you’re a home coffee lover, you could easily spend thousands of dollars on your...
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Science: Protecting your coffee’s flavours
For your coffee to taste its best, it’s crucial you buy fresh roasts and grind fresh.… .….Or maybe not. When I began creating this episode, I was convinced that ‘fresh is best’. But, after delving into the science of coffee freshness, I don’t believe that anymore. This episode goes deep into how...
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Science: How to think like a scientist
In the last episode, I discovered that rinsing my Chemex filter papers was a waste of time! As a result I’ve managed to claw back over seven days of my life left on earth. But why stop there? The coffee industry is full of elaborate ways of brewing and savouring coffee: fancy drippers, cold metal...
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Science: How to brew coffee like a scientist
Should you rinse your filter paper before making a filter coffee? Almost everybody in coffee internet says you should. But what if most of coffee internet was wrong? In this episode, I show you how I try to answer this question like a professional sensory scientist would. It’s hard. It’s...
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Science: Why don’t we see more organic coffee farms?
Farming coffee organically is amazing because soils are more alive, birds and insects are more plentiful, farmers avoid getting sick with agrochemicals. But, if it’s so great, why is less than 10% of the world’s coffee grown organically? The fact is, going organic is hard. Much harder than…
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Science: The magic of soil
The world’s farming soils are deteriorating quickly. Conventional coffee farming where plants are grown using agrochemicals allowed farmers to reap huge harvests these last 70 years. But these agrochemicals have been at the expense of soil health. I travel to Honduras to explore a potential...
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Science: Roasting made easy
Roasting coffee can be maddening. Just 4° Celsius is enough to make the same green beans taste distinctly different! And there are so many things roasters can play around with: temperature, time, fan speed, drum speed, types of probes…the list goes on and on. So, if you want to start roasting...
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Science: How roasting transforms coffee beans
What flavours do you want from your coffee? Every coffee bean begins its life green. And if you brewed it up without first roasting it, you’d get a yellow-green cup of grass-flavoured water. But, as soon you apply heat to a bean, the flavour can morph to from something quite vegetative to a very...
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Science: Do you and I taste the same flavours?
Ever wonder why you and your friends can taste the same coffee, but you can’t agree on the flavour notes? Join me as I explore this metaphysical mystery! I speak with leading scientists and ask: are the flavour receptors in your nose and mouth the same as mine? How does music and the shape of a…
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Science: How to be a better coffee taster
So you’ve just taken a sip of a very rare coffee, and flavours of passion fruit explode in your mouth. But here’s the thing: that flavour of passion fruit is not coming from your mouth. It’s not even coming from your nostrils. It’s being picked up behind your eyes! In this first episode of The...
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Introducing: Season 2 of The Science of Coffee
We're back with another series of The Science of Coffee! Across 10 science stories, narrative audio producer and coffee professional James Harper takes you on a journey into coffee's hidden microscopic secrets. James has spent the last year traveling to Central America, Greece, Norway…
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History: America’s love affair with coffee
America is coffee-obsessed. From Central Perk’s red couch being the centre of major plot twists in Friends to the fact the average American drank more than two cups a day. And the conventional explanation is pretty straightforward: an English colonist introduces coffee to Jamestown in 1607. 150...
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History: Italy’s democratic espresso culture
One morning back in the ‘80s, Howard Schultz walks out of his Milan hotel, stumbles into an espresso bar, and fundamentally changes coffee history. He discovered (and then popularises) the iconic, timeless Italian coffee experience: Rich thick coffee, an affordable price and great theatre. But…
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ABOUT THIS SHOW
Coffee stories with an extra shot of history and science. Filter Stories is a podcast revealing coffee’s hidden microscopic secrets, its powerful past, and how your choice of beans impacts tens of millions of people. See the behind-the-scenes stories on Instagram @filterstoriespodcast. If you haven’t already, please subscribe to the show and review us on Apple Podcasts and Spotify!
HOSTED BY
James Harper
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Frequently Asked Questions
How many episodes does Filter Stories - Coffee Documentaries have?
Filter Stories - Coffee Documentaries currently has 91 episodes available on PodParley. New episodes are automatically indexed when they're published to the podcast feed.
What is Filter Stories - Coffee Documentaries about?
Coffee stories with an extra shot of history and science. Filter Stories is a podcast revealing coffee’s hidden microscopic secrets, its powerful past, and how your choice of beans impacts tens of millions of people. See the behind-the-scenes stories on Instagram @filterstoriespodcast. If you...
How often does Filter Stories - Coffee Documentaries release new episodes?
Filter Stories - Coffee Documentaries has 91 episodes. Check the episode list to see recent publication dates and frequency.
Where can I listen to Filter Stories - Coffee Documentaries?
You can listen to Filter Stories - Coffee Documentaries on PodParley by clicking any episode. We provide an embedded audio player for direct listening, and you can also subscribe via your preferred podcast app using the RSS feed.
Who hosts Filter Stories - Coffee Documentaries?
Filter Stories - Coffee Documentaries is created and hosted by James Harper.
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